سنن أبي داود

'Umair, the freed slave of Ibn 'Abbas, said that he heard him say: I and 'Abd Allah b. Yasar, the freed slave of Maimunah, wife of the Prophet (ﷺ), came and entered upon Abu al-Juhaim b. al-Harith b. al-Simmat al-Ansari. Abu al-Juhaim said: The Messenger of Allah (ﷺ) came from Bir Jamal (a place near Medina) and a man met him and saluted him. The Messenger of Allah (ﷺ) did not return the salutation until he came to a wall and wiped his face and hands and then returned the salutation (i.e. after performing tayammum).